Machine for cutting and punching sheet material.



W122 n e55 es No. 385,237. PATBNTED APR.*-21, 1908.

v D. D. PROTHINGHAM.

MACHINE FOR CUTTING AND PUNOHING SHEET MATERIAL. I

- APPLIOA'HOR 2mm rx'n. 15,1901.

4 sums-sum 1.

Inv 611/20 7',

- n. 1), FROTHINGHAM.

PATENTED APR. 21, 1908.

MACHINE FOR CUTTING AND PUNOHING SHEET MATERIAL.

APPLICATION nun nus. 1a. 1901.

4 SHEETS-BHEET 2.

4 v I fnye7zior.' m'inessesl M f N ifxm 55 No. 885,237. PATENTED APR.21, 1908.

D. D. PROTHINGHAM. v

MACHINE FOR CUTTING AND PUNGHING SHEET MATERIAL.

. APPLIOATIONI'ILBD FEB. 16, 1907.

4 SHEBTfl-SHEET 3.

WW mg.

No; 885,237. PATENTED APR. 21, 1908. n. 1). FROT HAM.

MACHINE FOR TING AND HIN BET MATERIAL.

OATION 171 PLI LED FEB- 16. 7-

. 4 SHEETS-SHEET 4.

Witness 6,5.- [222/ en ior:

QLVQI UNITEDsTATEs DANIEL D. FROTHINGHAM, OF-SALEM, MASSACHUSETTS.

MA IILTE FOR CUTTING AND P'UNOHING SHEET MATERIAL.

Specification of Letters Patent.

Patented April 21, 1908.

Application filed. February 16, 1907. Serial No. 867,617.

To all whom it may concern: 4 Be it'known that I, DANIEL D. FROTHING-HAM, a citizen of the United States, residing at Salem, in the county ofEssex and State of Massachusetts, have invented new and usefulImprovements in Machines for Cutting and Punching Sheet Material, ofwhich the following is a specification.

This invention relates to a machine for d nking or cutting out articlesof sheet material, such as leather, from pieces or scraps of suchmaterial.

The object of the invention isto provide a fmachlne in which pieces orscraps of leather or the like may be placed in a machine by the operatorand pieces of such sheet material cut from said scraps and also punched,H desired, without danger of injury to the operator of the machine.

The object of the invention is further to provide a machine of thecharacter set foi th In which the operator laces the scra of leatherupon a cutting table and the mac ine then clamps said piece of scrap tothe cuttin table, carries it to the die, or to the die an punch, as thecase may be, where the piece of'material of the desired shape is cut orcut and punched and subsequently fed away from the die and unclamped orreleased from the clamping mechanism, when it is removed from thecutting table by the o erator, and placed in a convenient receptac e.

The invention consists in the combination and arrangement of parts setforth in the following specification and particularly pointed out in theclaims thereof.

Referring to the drawings: Figure 1 is a side elevation of my improvedmachine for view of the cutting table and mechanism, partly broken awayto save cutting and punching sheet material. Fig. 2 is a front elevationof the same, partly broken away to save space. Fig. 3 is a planwork-clamping space, with the stationary cam-shaft shown in section.'Fig. 4 is a sectional elevation taken on line 414 of Fig. 2, the samebeing broken away. Fig. 5 is a plan view, partly "in section, takenonllne 5-5 of Fig.- 4 and broken away to save space. Fig. 6 IS a planview, partly in section, taken on line 6-6 of Fig. 4, the same beingbroken away to save space. Fig. 7 is an enlarged section on line 44 ofFig. 2 of the punch and die, illustrating the same in the act ofpunching a piece of leather, :1 portion of the cutting table being tothe upper face of said shown in connection therewith. Fig. 8 is anunderneath plan of a die punches connected thereto. Fig. 9 is a planview of a piece of leather cut and punched With the die illustrated inFig. 8.

Like numerals refer to like parts through-- out the several views of thedrawings.

In the drawings, 10 is the frame of the machine, '11 and 12 the drivingpulleys, the pulley 11 being a loose ulley and-the pulley 12 rigidlyfastened to tlib shaft 13, journaled to rotate in bearings in said frame10. A in- 'ion gear 14'is fastened to the shaft 13 and meshes into agear 15 fast to the shaft 16, also journaled to rotate in bearin s inthe frame 10. The shaft 16 has a beve gear 17 fast thereto which meshesinto a bevel gear 18 fast to a vertical shaft 19 joumaled to rotate inhearings in the frame 10 and in the base 20 to which said frame 10 isfastened.

The base 20 is supported upon legs or brackets 21 and beneath said-baseare two with a plurality of Intermittent gears 22 and 23. Theintermittent gear 22 is fastened to the shaft 19 and the intermittentgear 23 is fastened to a shaft 24 journaled to rotate in a bearing inthe base 20. The shaft 24 has a cutting table 25 fast to the upper end.thereof and consisting of a disk 26 keyed tothe shaft 24 and having aplurality of concentrically arranged wooden cutting b ocks 27fasteneddbjiI clamps 28, 28

A plate 29 is fastened to the disk 26 by screws 30. Said plate isconcentric with the disk 26 and has pivoted thereon a plurality ofclamp-levers 31. Each of the clamplevers 31 is pivoted at 32 to a forkedbracket 33 which has a, stem 34 projectin downwardly therefrom andhaving screw-t eaded engagement with the plate 29. U on the under sideof the outer free end of t e lever is preferably rovided a flat strip35. A spring 36 hol s the outer end of the lever normally in contactwith the up er face of the block 27. The inner end 0 the lever projectsbeneath a stationary camlate 37 which is fastened to a stationa s aft38. The upper end of the shaft 38 is astened by a set-screw 39 to abracket 40, which bracket is fastened to the frame 10. The'lowerend ofthe shaft 38 projects downwardly through the plate 29-and is concentricwith the shaft 24. The disk 26 is supported upon its inner side, or theside adjacent to the frame, by a projection 41 upon said frame.

'tric rod 44 to a slide 45 adapted to slide in ways 46, 46 in the frame10. A die 47 is fastened to the lower end of said slide by means of aplate 48. The die 47 is hollow at its lower end, thus providing cuttingedges 49, and in the interior of said die is provided a resilientcushion 50, preferably formed of rubber. 51 are deta ably fastened tothe die 47 by means of screw-threaded stems 52 thereon. A flange 53 uponthe punch 51 limits the extent to which said punch can be screwed intothe die 47, and also assists in su porting the same when it is cuttingthe leat er.

It will be seen that the punch 51 can be removed from the die 47 byunscrewing the stem 52ofrom said'die and that the space or opening 54extending through said elastic cushion is of sufiicient size to enablethe punch and the flange 53 to be withdrawn om the die without removingsaid cushion. An ejector '55 is provided-for each of the punches 51 saidejector consisting of a rod which extends upwardly through the die 47and has screw-threaded en a cment with a cross-bar 56, said cross-bareing fastened at the opposite ends thereof to the legs of the bracket40. A set-nut 57 looks the'ejector 55 in position after the same hasbeen screwed to the desired height in the cross-bar 56. When differentsize punches are used, difierent size ejectors may also be employed, orwhere the punches are placed at different distances apart, the ejectorsare placed in alinement therewith, and in case of such variation ofpunches and ejectors the. crossbar 56 is changed to correspondtherewith,

the same being readily detached from. the

bracket 40 by unscrewing the screws 58, 58 (Fi .5). It will be seen byreference to Fig. 5 t at the bracket 40 has two legs 59, 59, eachprovided with a foot 60 which is fastened to the frame 10 by means ofcap screws 61, 61.

It is verydesirable in a machine of this class to have the cuttingblocks 27 constructed to be readily attached to or detached from thetable 26, and it is one of the objects of this invention to so constructsaid blocks and to so attach them to the table that they may be readilyattached to or detached from said table when it is desired to reneworreplace said blocks, and in order to secure this end grooves 69 and 70are formed in the inner and outer faces, respectively, of said blocks.The bottoms of said grooves are inclined at an angle to the top ofthetable 26, as illustrated in Fig. 4, andthe bottom faces of theclamp-plates, where they bear against the bottoms of said grooves, arealso inclined at an angle to the top of the table. Furthermore, thebolts71 which secure the outer A plurality of hollow punches 51,-

clamplates 28 t0 the table are inclined at anang e to the top of saidtable. The ends of the blocks 27, 27 abut a ainst each other and are cutat an angle so that said ends will lie in planes which radiate from thecenter of said cutting table, thus preventin said blocks from moving inthe direction of their length. I

In removing the blocks from the cutting table the nuts upon the bolts 71are removed and the clamplates 28 can then be immediately remove fromthe cutting table, and the blocks can then be'taken off and renewed orreplaced, as may be desired. When the reverse operation is erformed,that is, when the blocks are to be astened to the table 26',

said blocks are placed u on the table, as illustrated in Fig. 3, with tieir ends abutting against each other and with the clamp-plates 28projecting into the grooves 69. The clamp-plates 28 projecting into thegrooves 70 are then tightened by means of the bolts 71 and theirrespective nuts, and as said -1cla mp;plates stand at an angle to theupper surface of, the table and said bolts are located at an angle tosaid upper surface, when the nuts upon the bolts 71 are tightened, theclam -plates 28 force the blocks 27 inward y toward the center of thetable and against the clam -plates 28 and also force the ends of saidblocks against each other, thus firmly locking the blocks to the table,the clamps 28 bein secured to the table by screws 71. The w ioleoperation of removing a block and inserting a new one is very muchshortened by the means described.

Having thus specifically described my improved machine for dinking orcutting pieces of leather from scraps of the same, 1

will now proceed to describe the general operation-of the same. The 0erator stands or is seated in front of the mac ine, or at the right ofthe same, as viewed in Fig. 1. At this point the clamp levers 31 areraised, as seen in Figs. 1 and 4, so that the operator can placeportions of scrap material beneath the outer ends of the levers.vAssuming the machine to be in operation, the belt being on the tightpulley 12, the pinion 14 rotates the gear 15, thus rotating the shaft 16and the bevel gears 17 and 18 impart a rotary motion to the shaft 19which rotates the 1ntermittent pinion gear 22, thus imparting anintermittent rotary motion, tothe car 23, to the shaft 24, and to thecut-ting ta le 25, as well as to the plate 29 and-the levers 31 pivotedthereon. Said shaft 16 also imparts a vertical reci rocatory. motion tothe slide 45 through t e eccentric 42, eccentric straps 43 andconnecting rod 44, thus moving the die 47 downwardly and upwardly,together with the punches 51, 51 attached to said die. As the cuttingtable is, therefore, fed step by step in the direction of the arrow,(Fig. 3),

- the pieces of scrap 62 are brought one by one of said die'causes saidpunches, they pass through the eather and cut the same against the upperface of 1 27, as shown in'Fig. 7.

the segment block The resilient cushion yields at this time and theleather piece 63, which is cut from the scrap 62, passes upwardly intothe hollow die 47, a portion 64 of said scrap 62 passing upwardly mtothe interior of the As the die and punch retreat, the cushion 50 expandsand pushes the piece of material 63, cut from the scrap 62, downwardlyonto the block 27, while a continued upward motion the stationaryejector 55.

' to push the portion 64 out of the interior of the punch.

It will be seen by reference to Fig. 3 that the cam plate 37 is cutoutor recessed at 65 for a portion of the Way therearound, so that I whenthe levers 31 arrive at this cut-out portion, the s rings ull the outerends thereof downward yand c 27. After the leather has been cut,however,

and the cutting table starts to move in thedirection of thearrow (Fig.3) the inner end of the lever encpunters an incline 66 formed upon theunder side of 'saidcam plate 37 and is tipped downwardly at its innerend so as to release the iece of material in order that the same may eremoved from the table by the operator as it ap roaches her during thecontinued rotation o the table.

Having thus described my invention, what I claim and desire by LettersPatent to secure 1s:

1.- In a machine for cutting and punching sheet material, a die,mechamsmtoimpart a reciprocatory motion thereto, a cuttlng table,mechanism to impart an intermittent.

rotary motion to said cutting table, a series of levers pivoted to saidtable adapted to hold a iece of sheet material in contact with said tale, and meansto rock said levers to release said sheet material. I 2. Ina machine "for cutting and punching sheet material, a die, mechamsm toimpart a reciprocatory motion thereto, a cutting table, mechanism toimpart an intermittent rotary motionto said cutting table, a series oflevers pivoted to said table adapted to hold a iece of sheet material incontact with sai table, and astationary cam ada ted to engage saidlevers during the rotatlon of said table and to operate them'to alternately clamp and release said sheet material to and from said table,respectively.

3. In a machine for cutting and punching sheet material, a cuttingtable, mechanism to impart an intermittent rotary motion thereto, saidtable consisting of a disk with a plurality of concentrically arran edwooden cutting 'blocksfast thereto, a p ate fast to said disk andconcentric therewith, a plurahty of levers pivotally supported on saidwith punch 51.

rial, a hollow die having amp the scrap to the blocks.

sheet and release said sheet material plate, a vertical stationary shaftconcentric with said plate, the lower end of said shaft pro ecting intosaid plate, and a cam fast to respectively.

4. In a machine for cutting sheet material, a die, a hollow unchinclosed within said die, aresilient cushion extending around the inneredge of saiddie, and a stationary ejector extending through said punch.

In-a machine for cutting sheet matea cutting edge a resilient' cushionextending around the interior of said die adjacent to said cutting edge,and-a stationary ejector extending through said die. i

.61 In amachine for cutting sheet material, a hollow die, ahollow punchinclosed within saiddie and fast thereto, a resilient cushion extendingaround the interior of said die adjacent to its cutting edge, astationary ejector projecting downwardly into said punch, a cuttingtable, and mechanism to impart a reciprocatory motion to said die. 7. Ina machine for cutting sheet material, a hollow die, a hollow punchinclosed within said die and detachably fastened thereto, a resilientcushion extending around the interior of said die adjacent to itscutting edge, said cushion having an opening extending therethrou h toreceive said unch,

and ,a stationary e ector extending t rough said unch. I 8. n a machinefor cutting and punching material, a cutting table, mechanism to impartan intermittent rotary motion thereto, said table consisting of a diskwith a plurality of concentrically arranged wooden cutting blocks fastthereto, a p ate fast to said disk and concentric therewith, a pluralityof levers ivotally supported on saidplate, a vertical shaft concentricwith said plate, the lower end of said shaft projecting 1nto said plate,a stationary bracket-to which the u per end of said shaft is fastened,and a cam ast tosaid shaft and adapted to enga e said levers duringthe-rotation of said tab e and to operate them to alternately clamp toand from said blocks, respectively, in combination with a hollow die, ahollow punch inclosed within said die and fast thereto, a resilientcushion extending around the interior of said die to its, cutting edge,a stationary ejector projecting downwardly into said punch, a cuttingtable, and mechanism to mpart a reclprocatory motion to said die. 9 In amachine for cutting sheet material, a die, mechanism to impart areciprocatory motion thereto, a stationary ejector extending throughsaid die, a cutting table, an intermittent gear fast to said table, anda second intermittent gear adapted to intermitltently rotate said firstnamed gear and tab e.

'10. In a machine for cutting and punching sheet material, a cuttingtable, a plurality of wooden cutting blocks arranged concentrically uponsaid cutting table, each of said cutting blocks being provided withgrooves in opposite faces thereof, and clam plates fast to said cuttingtable and projecting into' sheet material, a cutting table, a pluralityof 1 wooden cutting blocks arranged concentrically upon said cuttingtable, each of said outting blocks being provided with grooves inopposite faces thereof, the bottoms of the outer set of said groovesinclined at an angle toward the top ofsaid table, and clamp-plates fastto said table and projectin into said outer set of grooves, whereby saiblocks are clamped to said table.

13. In a machine for cutting and punching sheet material, a cuttingtable, a plurality of wooden cutting blocks arranged c0ncentric allyupon said cutting table, each of said cutting block's being providedwith grooves in opposite faces thereof, and clamp-plates fast to saidcutting table and projecting into said grooves, whereby the under faceof one of said clamp-plates is inclined at an angle to the to of saidtable.

14. n a machine for cutting and punching sheet material, a die,mechanismto impart a reeiprocatory motion thereto, a rotar cuttingtable, and means to hold a piece of sheet material in contact with saidtable by spring tension.

15 In a machine for cutting and punching sheet material, a die,mechanism to impart a reci rocatory motion thereto, a rotary cuttingtabl e, and means to hold a iece of sheet material in contact with saitable by spring tension. 4

16. In a machine for cutting and punching sheet material, a die,mechamsm to impart a reeiprocatory motion thereto, a cutting table,,aseries of levers pivoted to said table adapted to hold a piece of sheetmaterial in contact with said table, springs adapted to normally causesaid levers to press said material against said table, and means to rocksaid levers to overcome the tension of said springs to release saidsheet material.

17. In a machine for cutting and punching sheet material, a die,mechanism to impart a reeiprocatory motion thereto, a cutting table,mechanism to impart an intermittent rotary motion to said cutting table,a series of lovers pivoted to said table adapted to hold a piece ofsheet material in contact with said table, springs adapted to normallycause said levers to press said material against said table, and astationary cam ada ted to engage said levers during a part of therotation of said table to overcome the tension of said springs torelease said sheet material from said table.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- IIBSSBS.

DANIEL n. FROTHINGHAM.

Witnesses:

LOUIS A. JoNEs, CHARLES S. ,GoomNe.

